Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-appsync-4334.json

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+{
+  "type": "api-change",
+  "category": "``appsync``",
+  "description": "[``botocore``] AWS AppSync now supports a new authorization mode allowing you to define your own authorization logic using an AWS Lambda function."
+}

.changes/next-release/api-change-elbv2-67451.json

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+{
+  "type": "api-change",
+  "category": "``elbv2``",
+  "description": "[``botocore``] Update elbv2 client to latest version"
+}

.changes/next-release/api-change-sagemaker-13384.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "[``botocore``] API changes with respect to Lambda steps in model building pipelines. Adds several waiters to async Sagemaker Image APIs. Add more instance types to AppInstanceType field"
+}

.changes/next-release/api-change-secretsmanager-37485.json

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+{
+  "type": "api-change",
+  "category": "``secretsmanager``",
+  "description": "[``botocore``] Add support for KmsKeyIds in the ListSecretVersionIds API response"
+}